eldrid: change power LED flicker frequency.
eldrid: change power LED flicker frequency.

Extend power led off time to 6sec in s0ix to save more power consumption.

BUG=b:170842004
BRANCH=firmware-volteer-13521.B-master
TEST=make buildall

Signed-off-by: Will <4f5d53892f27466fd868a3c0d9ba711e6393267a@wistron.com>
Change-Id: I6676ed8f152b0b199c222bb92efab0261acfa7e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2581123
Tested-by: Scott Chao <8cefa9751fac9aaa897ba1213763a96ba8dbd20d@wistron.corp-partner.google.com>
Reviewed-by: Keith Short <f6d578f97033c25f1206cb57d52f358974c82954@chromium.org>
Reviewed-by: Scott Chao <8cefa9751fac9aaa897ba1213763a96ba8dbd20d@wistron.corp-partner.google.com>
Commit-Queue: Keith Short <f6d578f97033c25f1206cb57d52f358974c82954@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec